Asp.net中显示所有缓存 清除所有缓存

//清除所有缓存
protected void RemoveAllCache()
  {
  System.Web.Caching.Cache _cache = HttpRuntime.Cache;
IDictionaryEnumerator CacheEnum = _cache.GetEnumerator();
  ArrayList al = new ArrayList();
  while (CacheEnum.MoveNext())
  {
  al.Add(CacheEnum.Key);
 }
 foreach (string key in al)
 {
 _cache.Remove(key);
 }
 show();
  }
  //显示所有缓存
  void show()
  {
 string str = "";
  IDictionaryEnumerator CacheEnum = HttpRuntime.Cache.GetEnumerator();
 
 {
 str += "缓存名[" + CacheEnum.Key+"]
" ;
  }
  this.Label1.Text = "当前网站总缓存数:" + HttpRuntime.Cache.Count + "
"+str;
  }